function s1_hello()
{
	echo "hello, world!"
}
function s2_tell_who_i_am()
{
	whoami
}
function s3_which_distro_do_i_use()
{
	grep "^NAME=" /etc/os-release
}
function s4_view_my_cpu_arch()
{
	uname -m
}
function s5_shou_first_scsi_disk_size()
{
	lsblk -b -l -o NAME,TYPE,SIZE | awk ' /^(sda|nvme0n1)[[:space:]]+disk/ { result = $3 / 10000000; print int(result);
	exit}'
}
function s6_shou_main_memory_size_im_megabytes()
{
	free -m | grep "Mem:" | awk '{print $2}'
}
